The kbdfs(8) man page (http://man.cat-v.org/9front/8/kbdfs)
documents how raw mode works on Plan 9:

  If the string rawon has been written to the consctl file and
  the file is still open, cons is in raw mode: characters are
  not echoed as they are typed, backspace, `^U,' `^W' and `^D'
  are not treated specially, and characters are available to
  read as soon as they are typed.  Ordinary mode is reentered
  when rawoff is written to consctl or this file is closed.

These dependencies needed to be updated to fix Plan 9 build:

  - github.com/fatih/color
  - github.com/mattn/go-isatty